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http -> https (the question was bumped anyway)
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Martin Sleziak
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$N$ Is a Number: A Portrait of Paul Erdős. (Official site; Wikipedia linkWikipedia link)
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$N$ Is a Number: A Portrait of Paul Erdős. (Official site; Wikipedia link)
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$N$ Is a Number: A Portrait of Paul Erdős. (Official site; Wikipedia link)
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Image link broken; now fixed.
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Joseph O'Rourke
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$N$ Is a Number: A Portrait of Paul Erdős. (Official site; Wikipedia link)
          Cover http://cs.smith.edu/%7Eorourke/MathOverflow/nistitle.jpgCover

$N$ Is a Number: A Portrait of Paul Erdős. (Official site; Wikipedia link)
          Cover http://cs.smith.edu/%7Eorourke/MathOverflow/nistitle.jpg

$N$ Is a Number: A Portrait of Paul Erdős. (Official site; Wikipedia link)
          Cover

Post Made Community Wiki by François G. Dorais
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Joseph O'Rourke
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$N$ Is a Number: A Portrait of Paul Erdős. (Official site; Wikipedia link)
          Cover http://cs.smith.edu/%7Eorourke/MathOverflow/nistitle.jpg